Dynamic damper

Abstract

To propose a dynamic damper that has high rigidity and in which a mounting member is less likely to deform.SOLUTION: A dynamic damper comprises first and second mounting members 3, 4 having a plate shape and attached to a component to be mounted 2, a mass member 11, and an elastic member 10 provided between the mounting members 3, 4 and the mass member 11. The first and second mounting members 3, 4 are in contact with each other on the elastic member 10 side, and are separated apart from each other as they move from contact parts 3b, 4b toward the component to be mounted 2.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a dynamic damper.

Background Art

[0002] Conventionally, a dynamic damper has been used to attenuate the vibration of an exhaust pipe mounted on a vehicle such as an automobile.

[0003] This dynamic damper is known to have a mounting member for mounting on an exhaust pipe, an elastic member provided on this mounting member, and a mass member provided on the side opposite to the mounting member of the elastic member.

[0004] However, there is a problem that the elastic member may soften due to heat from the exhaust pipe, the frequency characteristics may change, and it may not be possible to obtain the desired performance.

[0005] Therefore, it has been proposed to sandwich the exhaust pipe at one end side of a pair of side wall portions, connect the other ends with a plate material, form a mounting member in a U shape, and increase the length of the side wall portions to separate the elastic member from the exhaust pipe and reduce the thermal influence on the elastic member (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the dynamic dampers described in Patent Documents 1 and 2 above, since the mounting member is formed in a U shape and has low rigidity, if it deforms, the frequency characteristics may change, and there is a problem that the desired performance may not be obtained.

[0008] Therefore, an object of the present invention is to provide a dynamic damper having high rigidity and being difficult to deform the mounting member.

Means for Solving the Problems

[0009] In order to solve the above problems, the present invention includes a plate-shaped first mounting member and a second mounting member to be mounted on a component to be mounted, a mass member, and an elastic member provided between the two mounting members and the mass member. The first mounting member and the second mounting member are in contact with each other on the elastic member side, and are separated from each other as they go from this contact portion toward the component to be mounted side.

Effects of the Invention

[0010] In the present invention, since the first mounting member and the second mounting member are in contact with each other on the elastic member side and are separated from each other as they go from this contact portion toward the component to be mounted side, a triangular truss structure is formed by the first mounting member, the second mounting member, and the component to be mounted, and the rigidity of the mounting member can be made higher than that of the prior art, the mounting member is difficult to deform, and the frequency characteristics of the dynamic damper can be made to have desired performance.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0012] An embodiment of the dynamic damper of the present invention will be described based on an example shown in the drawings. [Embodiment 1] FIG. 1 is a front view of the dynamic damper 1 according to Embodiment 1 of the present invention, and FIG. 2 is a side view thereof.

[0013] As shown in FIGS. 1 to 5, the dynamic damper 1 is attached to a component to be attached such as an exhaust pipe through which exhaust gas discharged from an engine of a vehicle such as an automobile flows, and is used to attenuate the vibration of the exhaust pipe or the like.

[0014] The dynamic damper 1 has a plate-shaped first attachment member 3 and a plate-shaped second attachment member 4 that are attached to a component to be attached such as the exhaust pipe 2. An attachment portion 3a formed at one end of the first attachment member 3 is fixed to the exhaust pipe 2 or the like by fixing means such as welding. An attachment portion 4a formed at one end of the second attachment member 4 is fixed to the exhaust pipe 2 or the like by fixing means such as welding.

[0015] The attachment portion 3a of the first attachment member 3 and the attachment portion 4a of the second attachment member 4 sandwich the outer peripheral surface of the exhaust pipe 2, and the attachment portions 3a and 4a are arranged so as to be located in a direction perpendicular to the axial center of the exhaust pipe 2.

[0016] That is, the attachment portions 3a and 4a are attached to the exhaust pipe 2 such that the width direction of the attachment portions 3a and 4a, which is perpendicular to the direction from one end to the other end of the attachment portions 3a and 4a, becomes the axial center direction of the exhaust pipe 2.

[0017] A planar contact portion 3b is formed at the other end of the first attachment member 3 on the side opposite to the attachment portion 3a side, and a planar contact portion 4b is formed at the other end of the second attachment member 4 on the side opposite to the attachment portion 4a side. The contact portion 3b of the first attachment member 3 and the contact portion 4b of the second attachment member 4 are in contact with each other, and the first attachment member 3 and the second attachment member 4 are formed in a V shape such that the distance between the first attachment member 3 and the second attachment member 4 increases as they go from the contact portions 3b and 4b toward the exhaust pipe 2 side.

[0018] Further, the contact portion 3b of the first attachment member 3 and the contact portion 4b of the second attachment member 4 are It is fixed to the flat mounting seat 6 by any fixing means.

[0019] In this embodiment, a mounting bracket 7 is disposed between the mounting seat 6 and the abutting portions 3b and 4b. The mounting bracket 7 is formed in an L shape in which a flat elastic side mounting portion 7a and a flat exhaust side mounting portion 7b are orthogonal to each other. The abutting portion 3b of the first mounting member 3, the abutting portion 4b of the second mounting member 4, and the exhaust side mounting portion 7b of the mounting bracket are interconnected and fixed by bolts 8 and nuts 9. Note that the end of the mounting seat 6 may be bent to form the exhaust side mounting portion 7b, and the mounting seat 6 and the mounting bracket 7 may be integrally formed as one member.

[0020] In addition, for example, as shown in FIG. 3, the other end sides of the abutting portion 3b of the first mounting member 3 and the abutting portion 4b of the second mounting member 4 are bent in the direction opposite to the opposing mounting member to form seat mounting portions 3c and 4c, which may be fixed to the plate-shaped mounting seat 6 by welding or the like.

[0021] In this embodiment, the first mounting member 3 and the second mounting member 4 are configured in the same shape so that parts can be shared. Note that the first mounting member 3 and the second mounting member 4 may have different shapes.

[0022] An elastic member 10 such as rubber or a spring is attached to the side of the mounting seat 6 opposite to the exhaust pipe 2. In this embodiment, rubber is used as the elastic member 10.

[0023] A mass member 11 made of iron or the like having a predetermined mass is attached to the side of the elastic member 10 opposite to the mounting seat 6, and the elastic member 10 enables the distance between the mass member 11 and the mounting seat 6 to be expanded and contracted.

[0024] With the above structure, the exhaust pipe 2 and the elastic member 10 can be arranged at a distance that is less affected by the heat of the exhaust pipe 2. Moreover, the first mounting member 3, the second mounting member 4, and the exhaust pipe 2 form a triangular truss structure, ensuring a predetermined strength. Without the first mounting member 3 and the second mounting member 4 being deformed, the frequency characteristics of the dynamic damper 1 can be made to have desired performance. In addition, the thermal degradation of the elastic member 10 over time due to the heat of the exhaust pipe 2 can be suppressed.

[0025] Further, the first mounting member 3 and the second mounting member 4 are configured to have the same shape, and by sharing parts, the production cost can be reduced.

[0026] [Embodiment 2] In this Embodiment 2, among the contact portions 3b of the first mounting member 3 and the contact portions 4b of the second mounting member 4, the contact portion 4b(3b) located on the exhaust side mounting portion 7b side of the mounting bracket 7 and between the exhaust side mounting portion 7b of the mounting bracket 7, as shown in FIG. 4, is an embodiment in which a heat insulating member 20 is provided.

[0027] By providing one or more heat insulating members 20 between the contact portion 4b(3b) and the exhaust side mounting portion 7b of the mounting bracket 7, the heat of the exhaust pipe 2 can be further suppressed from being transmitted to the elastic member 10, and the thermal degradation over time can be further suppressed.

[0028] Other configurations and structures are the same as those in the above Embodiment 1, so the description thereof is omitted.

[0029] Also in this Embodiment 2, the same operations and effects as those in the above Embodiment 1 are achieved.

[0030] [Embodiment 3] In the above Embodiments 1 and 2, the outer peripheral surface of the exhaust pipe 2 is clamped by the mounting portions 3a of the first mounting member 3 and the mounting portions 4a of the second mounting member 4, and the mounting portions 3a, 4a are arranged so as to be located in a direction perpendicular to the axial center of the exhaust pipe 2. However, as shown in FIGS. 5 and 6, the exhaust pipe 2 may be mounted such that the mounting portions 3a, 4a are located in the axial center direction of the exhaust pipe 2.

[0031] That is, the attachment portions 3a and 4a are attached to the exhaust pipe 2 such that the width direction of the attachment portions 3a and 4a, which is orthogonal to the direction from one end to the other end of the attachment portions 3a and 4a, becomes the circumferential direction of the exhaust pipe 2.

[0032] Other configurations and structures are the same as those in the above-described first and second embodiments, and thus the description thereof is omitted.

[0033] Also in this fourth embodiment, the same operations and effects as those in the above-described first and second embodiments are achieved.

Description of Reference Numerals

[0034] 1 Dynamic damper 2 Exhaust pipe (component to be attached) 3 First attachment member 4 Second attachment member 10 Elastic member 11 Mass member

Claims

【Claim 1】 A plate-shaped first mounting member and a second mounting member to be attached to a component to be attached, a mass member, and an elastic member provided between the two mounting members and the mass member. The first mounting member and the second mounting member are in contact with each other on the elastic member side, and are separated from each other as they go from this contact portion toward the component to be attached side. A dynamic damper characterized by this.

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